Medicinal grade white vaseline for use properties

Medicinal grade white vaseline is waterproof, is a very good moisturizing product, used for the preparation of medicinal ointments and raw materials for skin protection ointments; Ingredients for cosmetic creams, balsam oils, etc.
; Emulsifying paste for lubricating silk fabrics in the textile industry; Temporary protection of precision instruments and medical devices
.

It can also be used as a softener for rubber products
.

Solid mixture
.

Properties This product is white or slightly yellow uniform ointment; Odorless or almost odorless; Slippery sensation in contact with the skin; It has a certain amount of
drawing.

This product is easily soluble in benzene at about 35 ° C, dissolved in chloroform at about 35 ° C, slightly soluble in B, and almost insoluble
in ethanol or water.

【Inspection】 PH Take 35.
0g of this product, put it in a 250ml beaker, add 100ml of water, heat it to a slight boil, stir for 5 minutes, let it cool, divide the aqueous layer, add 1 drop of phenolphthalein indicator solution, it should be colorless; then add methyl orange indicator solution 0.
10ml, not pink
.

Color Take 10.
0g of this product, put it in a beaker, heat it on the water bath to melt, move it into a colorimetric tube, and compare it with the same volume of control solution (take 0.
2ml of copper sulfate solution for colorimetry and 7.
8ml of potassium dichromate solution for colorimetrics, mix well, take 2.
5ml of mixing solution, add water to 25ml), and do not go deeper
.

Impurity absorbance Take this product, add trimethylpentane to make a solution containing 0.
50mg per 1ml, according to the ultraviolet - visible spectrophotometry (general 0401), measured at a wavelength of 290nm, absorbance shall not exceed 0.
50
.

Polycyclic aromatic hydrocarbons Take 1.
0g of this product, put it in a dispensing funnel, add 50ml of n-hexane to dissolve, add dimethyl sulfoxide shake extraction twice, 20ml each time, merge the lower liquid, add n-hexane 20ml, shake for 1 minute, remove the layer liquid, place in a 50ml measuring bottle, add dimethyl sulfoxide diluted to the scale, shake well, as a test solution
.

Take 10 ml of dimethyl sulfoxide and 25 ml of n-hexane, shake, layer, remove the layer of liquid as a blank solution
.

Take an appropriate amount of naphthalene control, make a solution containing 6 μg per 1 ml with a blank solution as a control solution, according to the ultraviolet- visible spectrophotometry (general principle 0401), take the sample solution in the range of 260 ~ 420 nm to determine the absorbance, the maximum value of which must not exceed the absorbance value
of the control solution at a wavelength of 278 nm.

Sulfide Take 3.
0g of this product, check according to law (General Principle 0803), should comply with the regulations (0.
00017%)
.

Organic acid Take 20.
0g of this product, add neutral dilute ethanol (neutral to phenolphthalein) 100ml, stir and heat to boiling, add 1ml of phenolphthalein indicator solution and sodium hydroxide titration solution (0.
1mol/L) 0.
40ml, strong stirring, should appear red
.

Heterosexual organic compounds and blazing residue Take 2.
0g of this product, place it in a crucible of constant weight at 550 ° C, heat it with a direct fire, it should be free of spicy odor; and then blanch (general 0841), the residual residue shall not exceed 1mg (0.
05%)
.

Fixing oil, fat and rosin Take 10g of this product, add 50ml of 5mol/L sodium hydroxide solution, place in a water bath for 30 minutes, separate the water layer, acidify with 2.
5mol/L sulfuric acid solution, and do not generate oil or solid substances
.

Heavy metals Take 1.
0g of this product, check according to law (General Principle 0821 Second Law), and contain heavy metals shall not exceed 30 parts per million
.

Arsenic salt Take 1.
0g of this product, add 10ml of 2% magnesium nitrate ethanol solution and 1.
5ml of concentrated hydrogen peroxide solution (30%), small fire to make carbonization, let it cool, if not completely ashed, then add a certain amount of nitric acid recharization, 550 °C blazing to ash completely
.

Inspection in accordance with the law (General Provisions 0822 Law II) should comply with the provisions (0.
0002%)
.